netdev - Re: [PATCH net-next 11/18] switchdev: remove old netdev_switch_port_bridge

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Date:	Mon, 30 Mar 2015 13:20:23 -0700
From:	Scott Feldman <sfeldma@...il.com>
To:	roopa <roopa@...ulusnetworks.com>
Cc:	Netdev <netdev@...r.kernel.org>,
	Jiří Pírko <jiri@...nulli.us>,
	Guenter Roeck <linux@...ck-us.net>,
	Florian Fainelli <f.fainelli@...il.com>
Subject: Re: [PATCH net-next 11/18] switchdev: remove old netdev_switch_port_bridge_setlink

On Mon, Mar 30, 2015 at 6:23 AM, roopa <roopa@...ulusnetworks.com> wrote:
> On 3/30/15, 1:40 AM, sfeldma@...il.com wrote:
>>
>> From: Scott Feldman <sfeldma@...il.com>
>>
>> New attr-based bridge_setlink can recurse lower devs and recover on err,
>> so
>> remove old wrapper.  Also, restore br_setlink back to original and don't
>> call
>> into SELF port driver.  rtnetlink.c:bridge_setlink already does a call
>> into
>> port driver for SELF.
>>
>> Signed-off-by: Scott Feldman <sfeldma@...il.com>
>
> removing this now requires every vlan add to be a two step process, why ?

No, that's not true.  You want to use
ndo_vlan_rx_add_vid/ndo_vlan_rx_kill_vid in your port driver, and then
using either vlan driver standalone or the bridge driver vlan support
will work.

Try it.  Implement ndo_vlan_rx_add_vid in your port driver and verify
you get called to add VLAN to port with either:

    bridge vlan add dev swp1 vid 10

    -or-

    vconfig add swp1 10

Same for deleting a VLAN, either of these two commands call into the
port driver ndo_vlan_rx_kill_vid:

    bridge vlan del dev swp1 vid 10

    -or-

    vconfig rem swp1 10


> bridge vlan add dev swp1 vid 10
> bridge vlan add dev swp1 vid 10 self

Not necessary.  The first command is sufficient if using
ndo_vlan_rx_add_vid.  If you want the self version to work, add
ndo_bridge_setlink/dellink ops to your port driver.

> and userspace will get two notifications.

Single command (as shown in my examples) generates one user notification.
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